10 Most common mistakes when building your computer

Updated: July 6th, 2018BrantonGuides4 Comments

most common mistakes build your own computer

Trying to build your own computer isn’t the hardest thing you’ll ever do, but to say there’s nothing that could go wrong would not be accurate in the least bit. There’s actually a lot that could get in the way of you and a completed build. Luckily, more often than not it’s going to be a simple mistake that can easily be fixed.

So, today, let’s take a look at the most common mistakes to make when building your own computer.

1. Buying incompatible hardware

One of the easiest mistakes to make when building your own computer is buying incompatible hardware.

It might be that your CPU is not compatible with your motherboard, or your motherboard simply doesn’t support the type of storage you bought. Or maybe you bought a CPU cooler that’s too big for your case. Regardless, buying incompatible hardware is a serious headache that can be avoided by simply doing some research before hitting that buy button.

I’m not just talking about the basic “will it work together?” type of compatibility, but all types. From the physical size of components to power consumption, and even the amount of storage drives you want to run, all facets of your build must be considered!

2. Installing the CPU wrong

This is more common than you might imagine. A lot of people just aren’t aware that processors must be installed in a certain orientation. This is no fault of your own, it’s just never made super clear anywhere unless you’re reading absolutely every bit of documentation you receive with your hardware.

Luckily, it’s really easy to know which direction to install your CPU. All processors will have some kind of marking on one of the corners, on AMD chips it’s a gold arrow usually found on the bottom-left corner. That marking has to be lined up with the marking you’ll find on your motherboard’s CPU socket, often on the socket’s “load plate” or the metal part that locks your CPU down – sometimes this indicator is found on the board itself.

3. Forgetting the CPU power connection

Another extremely common mistake to make is missing the CPU power connection. This happens so often that probably 50% of new builders will run into this problem on their first build. So, if this is you, there’s definitely nothing to feel bad about.

Your CPU power connection is going to be found in the top left corner of your motherboard. Failing to hit that with a power connection will result in your build doing absolutely nothing when you try and power it on. It often requires a 6 or 8-pin connection from your PSU, it might even be marked as cpu_pwr or something along those lines.

4. Not plugging the CPU cooler in

It’s not uncommon to forget to plug your CPU cooler in. I know how it is, you’re excited to get your new build together, you slot your CPU, lock your cooler down… but forget the power connection that’s likely bundled into/around the fan. No worries, we’ve all been there.

You’re going to find your CPU cooler connection somewhere around the CPU socket on your motherboard. Where exactly changes per board, but it’ll definitely be around there somewhere – more than likely marked as “cpu_fan” or something similar.

5. Leaving the plastic cover on your CPU cooler (or forgetting TIM)

Did you know there’s usually a little slip of transparent plastic that keeps your stock CPU cooler’s thermal paste from getting on everything? If you didn’t, well, you should probably check your CPU cooler to make sure you removed it!

Not only will that slip of plastic result in bad cooling, but in the worst case scenario it could melt and damage your motherboard – not ideal! Even aftermarket CPU coolers will have a little slip of plastic that you have to be aware of, it’ll usually say “remove before use” in big red letters. Thankfully, some coolers come with such large covers that it would be impossible to miss.

If you bought an aftermarket cooler, did you remember to add a small dab of thermal paste (aka TIM) to your CPU before locking your cooler down? If you didn’t, you have to ASAP. Chances are your CPU cooler came with some thermal paste, maybe in a small tube or maybe in a small bag, either way you likely have some kicking around if you bought an aftermarket CPU cooler.

6. Trying to slot RAM wrong / not seating it fully

Almost as common as trying to install a CPU cooler wrong, is trying to install RAM wrong or not seating it fully. Installing RAM wrong can have a couple of different effects, one being that it just won’t go in the slot, and the other being it won’t take advantage of dual channel pairing. Not seating your RAM fully can end up with your build not functioning.

Similar to a CPU, RAM also has a certain way it has to be installed in the DIMM slots. If you look closely at the pins on your stick of RAM, you’ll notice that it’s not split 50/50. It’s more of a 60/40 split, right? Well, if you check out your motherboard RAM slot now, you’ll notice that it’s also split 60/40. I think you get the idea now.

Beyond that, if you’re running dual channel RAM, your motherboard will have a set position for your sticks – this is important if you’re running a dual channel pair. Often times, your sticks of RAM will alternate slots, but some motherboards will have them right beside each other – this changes based on the board so make sure you’re double-checking the manual!

Not seating your RAM fully is an equally simple problem to fix. When you’re installing your RAM, you want to use even pressure on either end until you hear the stick *click* into the slot. If you didn’t hear any clicks while installing your RAM, chances are it’s not seated fully – just give it another push and you should be good to go.

7. Rogue motherboard standoffs

The little metal pegs inside of your case that you mount your motherboard on are called standoffs. These should be used only where they’re needed, any extra standoffs should always be removed from your case and kept aside.

Although slightly less common than the other mistakes we’ve talked about so far, this can have very negative effects – like shorting your motherboard out.  As you can imagine, that’s not a good thing to do; at best your PC will shut itself off, at worst you could fry something.

Better to avoid that and spend the extra 5 seconds to twist out any unneeded motherboard standoffs!

8. Forgetting a connection for storage (HDD/SSD)

Forgetting a storage connection is more common than you might think. All drives outside of M.2 SSDs require 2 connections, 1 from your power supply and one from the drive to your motherboard. It’s not uncommon for someone to only connect one without knowing.

9. Not connecting front I/O panel (or doing it wrong)

Failing to connect your front I/O panel is going to result in your power/reset buttons not working along with anything else you might have there. So, if you’re sitting there hammering your power button wondering why your PC won’t turn on, this is something to check for.

The front I/O connections can usually be found bundled together and shoved in the front of your case somewhere. It’ll be a bundle of usually 8 1-pin connections and 1 larger audio connection if you have mic and headphone jacks. These all connect along the bottom of your motherboard, check your manual for the exact location and layout of your front I/O connections.

10. Plugging your monitor into your motherboard (instead of your graphics card)

Last but not least, one of the most annoying problems of them all – plugging your monitor into the wrong display output. When this happens, your PC will fire up like normal and everything will whirr and buzz to life… Everything except your monitor which will likely only display something semi-depressing like “No Source Signal”.

Before you panic, double check where your monitor is plugged in. Is it connected to your motherboard’s rear I/O panel? If it is, you want to unplug that and then move the connection down a few inches to your graphics card instead (assuming you have one).

If it’s already plugged into your graphics card, check that the card itself has power. Plugged in? Check that the connection is fully plugged in on the PSU end. That’s in too? Is your card seated fully? Did it click into place like your RAM did? If it is AND your graphics card is not powering on while everything else is, it’s possible that your card is faulty.

Conclusion

There you have it, the 10 most common mistakes to make when attempting to build your own computer. The vast majority of these are not detrimental to the health of your system, as long as you rectify them ASAP.

If you made one, or several of these mistakes, don’t feel bad. Everyone starts somewhere and you’re bound to make some mistakes when learning a new skill. Personally, I call them learning experiences – as long as you take a lesson away from the mistake you made then chances are you won’t make the same mistake twice.

About the Author
Branton

Branton

Hey there! I'm Branton, the founder and lead editor here at PC Game Haven. Since our launch in 2015, we've helped thousands upon thousands of gamers build their dream desktops, find the perfect peripherals, and more. Thanks for stopping by!

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Tyler

Awesome

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Tyler

Oops i didn’t mean to comment yet. I wanted to say awesome, this helped because i wasn’t sure but i hit send by accident

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And i mean because #6. My ram didnt go in all the way